Seborrheic dermatitis on the scalp is a common inflammatory skin condition characterized by red, itchy, and flaky patches. It results from the overgrowth of a yeast called Malassezia. This fungus triggers an inflammatory response, leading to excessive shedding of skin cells. Symptoms include dandruff, redness, and sometimes greasy or scaly patches. Treatment involves medicated shampoos containing antifungal agents like ketoconazole, selenium sulfide, or zinc pyrithione. In severe cases, topical corticosteroids or antifungal creams may be prescribed. Regular cleansing and maintenance with appropriate products help manage symptoms and prevent flare-ups of this chronic condition.